Raffaello Pantucci, from the Royal United Services Institute, says: "we know from other cases that there are individuals from Cardiff who have tried to go and join al-Shabaab."

"So it seems very likely that some of those individuals from the broader Somali diaspora, and in fact the broader Muslim community around Cardiff, may have been drawn by al-Shabaab's radical message, to go and join the group and participate in its fighting."

"I think the government does see Cardiff as a place where there is a problem with radicalisation, and maybe more of a focus than some smaller cities, but whether Cardiff would rank as a top priority, I'm not totally sure."